Technical Service Bulletin Poor Starter Engagement

Subject: Poor Starter Engagement                   Models: 911 Carrera 1989

Bulletin Number: 89 – 02

911 Carrera with G50 Transmission

poor starter parts fix solve

To improve starter engagement a wider ring gear is installed beginning with Model Year 1989.

Engine number 64 K 01999 to 64 K 022088 and then from engine number 64 K 03112 on.

When replacing cars with starter engagement, problems outside of the above engine number ranges, the ring gear is damaged, install the new wider ring gear PN 950.116.143.01. Also the starter gear should be checked for damage. If necessary replace starter.


Make sure the ring gear is installed correctly; Flat surface towards pressure plate. Recessed surface towards bolt head (Figure 2)

Bolt torque: 24Nm (18 ft. lbs.)

Important Notice: Technical Bulletins are intended for use by professional technicians, not a “Do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could in the proper service of a vehicle. Special tools may be required to perform certain operations identified in these bulletins. Use of tools and procedures other than those recommended in these bulletins may detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.

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